What Is IRS Notice CP501?

If you receive a CP501, it means the IRS sent you a CP14 previously — the first notice of balance due — and you haven't paid the full amount. The CP501 is essentially a friendly reminder, but it also signals that the IRS's collection process is moving forward.

The CP501 will show the same basic information as the CP14: the tax year in question, the tax owed, penalties and interest that have accrued (which will now be higher than they were on the original CP14 since time has passed), and a new total balance due. It will give you a new deadline — typically about 21 days from the date of this notice — to pay or make arrangements.

The best response to a CP501 is the same as for a CP14: pay in full if you can, or contact the IRS to set up a payment plan if you can't. An installment agreement can be requested online at irs.gov for balances under $50,000 — the process is fast and usually doesn't require speaking with anyone. If you believe you've already paid and the payment simply hasn't been credited, call the number on the notice with your payment confirmation information. Penalties and interest accrue every day you wait, so acting quickly saves money even if you're setting up a payment plan rather than paying in full.

After the CP501, if no payment or arrangement is made, the IRS typically sends a CP503 — a second reminder — followed by the much more serious CP504, which warns of an impending levy on state tax refunds and is a legally significant escalation. The CP501 is still early in the process, and responding to it now avoids far more stressful consequences later.